Air-brake mechanism.



No. 784,321. PATENTBD MAR. 7, 1905.

H. E. HADDOGK.

AIR BRAKE MECHANISM.

APPLICATION FILED JULY 21, 1904.

UNITED STATES Patented March '7, 1905.

PATENT OFFICE.

HENRY E. HADDOOK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JOHN 'A.BRILL, OF PHILADELPHIA, PENNSYLVANIA.

AIR-BRAKE MECHANISM.

SPECIFICATION forming part of Letters Patent N 0. 784,321, dated March'7, 1905.,

Application filed July 21, 1904. Serial No. 217,465.

To (all whom, it new concern:

Be it known that I, HENRY E. HADDOCK, a citizen of the United States,and a resident of the city and county of Philadelphia, State ofPennsylvania, have made new and useful Improvements in Air-BrakeMechanism, of which the following is a specification.

The object of my invention is to provide means whereby the brakes willbe released IO promptly and efliciently when the air-brake cylinderceases to act, and this I accomplish by the means hereinafter disclosed.

For a more particular description of my invention reference is to be hadto the accompanying drawings, in Which Figure 1 is a plan View of thatpart of the brake mechanism to which my improvement relates, and Fig. 2is a section of the end of the spring.

1 and 2 are the brake-rods, which are pivoted to the levers 3 and 4,respectively, at the ends of said levers. The levers 3 and A are unitedby the link 5, which is pivoted to said rods at 6 and 7, and theair-brake cylinder 8 is also pivotally connected to these levers 3 and 4in the manner described below. At the other extreme ends of the levers 3and 4 are shackles 9 and 10, respectively, which are united by means ofa coil-spring 11. The

brake-cylinder 8 has the usual connection with the source of air-supply,which is not shown. and is connected with the car-body in any suitablemanner. The cylinder-head 12 has projecting lugs 13, which pass on eachside of the lever 3, and a pivot 14 passes through both the lugs 13 andthe lever 3, thereby pivotally connecting one end of the brake-cylinderwith the lever 3. The other lever, at, is pivotally connected to thepiston-rod 15 of the cylinder 8 by means of a pivot-pin 16. Astufiing-box 17 surrounds the rod 15 and causes it to have a right-linemotion only. This stuiiing-box 17 is attached to the cylinder-rod 18 ofthe cylinder 8.

From the foregoing the operation of my improved brake mechanism will bereadily understood. Assuming the mechanism to be in the position shownin Fig. 1, when air is admitted to the cylinder the rod 15 is therebythrust outwardly and moves the lever 1 against 5 the action of thespring 11. The pivot 7 forms a fulcrum which has a slight movement, butnot as great as the movement of the pivot 16, so that the rod 2 is drawnin the direction of the rod 1, thus causing the brakes to be applied tothe Wheels of one truck. As soon as the rod 2 reaches the limit of itsmovement the link 5 draws the rod 3, which is fulcrumed on the pivot 14and through the rod. The brakes are applied to the wheels on the othertruck, the rod 1 being drawn in the direction of the rod 2, and thelower end of the lever 3 acts against the spring 11, thereby elongatingit. hen air is released from the brake-cylinder 8, the spring 11 drawsthe lower ends of the levers 3 and 4 together, thereby causing thepiston 15 to assume the position shown in the figure and separating theends of the levers 3 and 4, to which the rods 1 and 2 are attached.

Having thus described my invention, what 7 I claim is 1. In a brakemechanism, levers, a link and spring connecting said levers, andabrake-cylinder connecting said levers and located between said link andspring.

2. In an air-brake mechanism, levers, a link pivotally connecting saidlevers, a spring pivotally connected. with the ends of said levers, andan air-cylinder pivotally connected with said levers and located betweensaid link and spring, said air-cylinder having its pistonconnected withone link and a cylinder-head connected with the other.

Signed at the city of Philadelphia, county of Philadelphia, and StatePennsylvania, this 5 11th day of July, 1904. l

HENRY E. HADDOGK.

Witnesses:

S. H. MEILLINes, J r., W'ALTER S. ADAMS.

